Blake Lively in 'The Rhythm Section'

Blake Lively, is that you? The former "Gossip Girl" star stripped away her signature red carpet glamour for an almost unrecognizable look to take on her latest film role in "The Rhythm Section." The 30-year-old wife of fellow actor Ryan Reynolds is a mother of two.

Kate Hudson

Kate Hudson shaved her head for a mysterious new role. The actress, who typically wears her hair long and blonde, is nearly unrecognizable with her new hairdo which is rumored to be for an upcoming flick with singer Sia. Click here for more news about Hudson's new role.

(Reuters/Backgrid)

kate-hudson

Jennifer Lopez

Jennifer Lopez seriously dressed down for her role in the series "Shades of Blue." Here, JLo is seen on set for the NBC show, portraying her character Harlee Santos.

(Reuters/ Splash News)

jennifer-lopez

Darius Rucker

The country singer star went incognito for a special episode of "Undercover Boss." Rucker traveled to Austin, Texas' famous Sixth Street to run an open mic night in search of standout street performers in an episode airing May 12 on CBS.

(CBS)

darius-rucker

David Beckham

David Beckham looks like a different person as he showed off his makeup for his role in Guy Ritchie's upcoming "King Arthur: Legend of the Sword." The good-looking dad sported rotting teeth and a heavily-scarred face in a new pic on Instagram. "Rough day at the office," Beckham, who plays a knight, wrote alongside the picture of himself. Click here for more pics of the soccer star on Hollywoodlife.com.

(Reuters/Instagram)

david-beckham

Tilda Swinton

It's hard to believe both of these pictures are of Tilda Swinton. The actress was dressed as an elderly gentleman on the set of her new film in Berlin. PHOTOS: See Margot Robbie as Tonya Harding

Adam Driver

Adam Driver looked scarily-thin in the trailer for his upcoming movie "Silence." The actor revealed he had to lose 50 pounds to portray a 17th century Jesuit priest in the Martin Scorsese drama. Click here for more pictures of the actor on Hollywoodlife.com.

Matthew McConaughey

Balding is not a good look for Matthew McConaughey. The heartthrob debuted his less-than-pretty look for his new role in the trailer for his new movie "Gold." Click here fore more pictures of the star on Hollywoodlife.com.

(Reuters/Black Bear Pictures)

matthew-mcconaughey

Neil Patrick Harris

Neil Patrick Harris looks completely different with no hair and a long beard while filming in Vancouver for 'A Series of Unfortunate Events' on May, 6 2016.

Kacey Musgraves

Kacey Musgraves looked far from her glamorous self in her new music video for her sit single "Biscuits." She put her hair up in a hat, had dirt smudged on her face and wore a fake mustache (left) in one of the video's scenes.

(Mercury Records)

kacey-musgraves

Kevin Bacon

Is that really you Kevin Bacon? The actor tweeted out a selfie looking like he's been eating too much bacon lately. "The Following" star didn't offer an explanation for his strange look, he simply wrote, "Greetings from the U.K." to his Twitter followers. Many online speculated that the actor was wearing makeup for an upcoming television advertisement.

Felicity Huffman

Felicity Huffman's look in her new show "American Crime" is a far cry from her "Desperate Housewives" character. The actress' grandmotherly outfit, drab hair and makeup-free face gave the star a grittier look than her typical red carpet look (left).

Emma Stone

Emma Stone was just one of the many stars to perform on "Saturday Night Live's" 40-year special. "The Help" star donned a frizzy black wig to play the late Gilda Radner's famous "SNL" character Roseanne Roseannadanna.

(NBC/Reuters)

emma-stone

Taryn Manning

All of the actors on "Orange Is the New Black" underwent makeunders for their roles as prison inmates on the hit Netflix original series, but Taryn Manning's transformation is perhaps the most shocking. The 36-year-old dons long brown hair extensions and fake teeth to play her meth-addicted character Tiffany "Pennsatucky" Doggett.

(Reuters/Netflix)

taryn-manning

Jennifer Aniston

Jennifer Aniston showed off her dramatic side in the Golden Globe-nominated film "Cake." The 45-year-old went sans makeup (L) and it was "terrifying" to step out of her comfort zone, she said. "It was a terrifying, risky thing but I just said, 'You've got to try. At this point, who cares?

(AP/Reuters)

jennifer-aniston

Natalie Dormer

Natalie Dormer shaved half of her head to play "Hunger Games" character Cressida. We definitely prefer Dormer's long locks and beautiful gowns of her "Game of Thrones" character Margaery Tyrell.

James Franco

James Franco debuted a terrifying new "do." The actor shaved his head for an upcoming role in "Zeroville," the film based on Steve Erickson's book of the same name. The creepy fake mustache he also debuted completed the less-than attractive look.

(Reuters)

james-franco

Taylor Swift in 'Ew'

Swift showed off her geeky side in a skit for the "Tonight Show" with Jimmy Fallon (C). The singer transformed into Natalie, a 14-year-old girl with a band aid collection. "My mom hasn't let me watch television since Miley Cyrus twerked," Swift's alter ego said. Watch the hilarious clip here.

(Reuters/Douglas Gorenstein/NBC)

taylor-swift-in-'ew'

Sofia Vergara

Vergara shocked onlookers as the actress stepped out with disheveled hair, smudged lipstick and tatty sweats. This new look is far from Vergara's usual form-fitting clothes and blown-out hair. Fortunately, the star's scary look is merely for a scene for her hit show "Modern Family." Click here for more pictures of Sofia's less than flattering look.

(Fame Flynet/Reuters)

sofia-vergara

Ryan Reynolds

Usually we'd want to be anything but "Just Friends" with Ryan Reynolds. The normally chiseled star donned a fat suit for his role in the 2005 film.

(New Line Cinemas/Reuters)

(New Line Cinemas/Reuters)

ryan-reynolds

Emma Thompson

A prosthetic nose, fake teeth and several layers of makeup transformed the British actress into the unfortunate-looking Nanny McPhee.

(Universal Pictures/Reuters)

emma-thompson

Anne Hathaway

Before Anne's "The Princess Diaries" character underwent a royal makeover, she was frizzy to a fault. But the not-so-glamorous role still put her on the map.

(Reuters/Walt Disney Pictures)

anne-hathaway

Mariah Carey

The sexy blonde bombshell went grungy, bare-faced brunette for her role as a social worker in 2009's "Precious."

(Reuters/Lionsgate)

mariah-carey

Cameron Diaz in "Annie"

Blonde beauty Cameron Diaz looked harsh for her role as Ms. Hannigan in the "Annie" remake.

Javier Bardem in "Skyfall"

Penelope Cruz's hubby was almost unrecognizable in the Bond film "Skyfall." The makeup was over the top and his contacts and lighter hair color were downright scary.

And this wasn't even the part when he took out his ... well we won't say in case you haven't seen it yet.

But he's not the only actor who has had to play down his natural good looks to play a part.

Click through for some more stars who had to spend lots of time in hair and makeup to look this bad.

(MGM/Reuters)

javier-bardem-in-"skyfall"

Matthew McConaughey in 'Dallas Buyers Club'

The usually buff actor lost almost 40-pounds to play Ron Woodruff, a hard-living man with HIV for the 2013 drama due out in December.

It's quite early, but Oscar buzz for McConaughey has already begun.

(Reuters/Splash)

matthew-mcconaughey-in-'dallas-buyers-club'

Jared Leto in 'Chapter 27'

Jared's boyish good looks are normally on display on screen, but he went practically incognito when he played Mark David Chapman in 2007. It was hard to believe that it was even him.

(x17online.com/Peace Arch Entertainment)

jared-leto-in-'chapter-27'

Christian Bale in 'The Machinist'

The Aussie actor had originally intended on losing close to 100 pounds for the 2004 role, but directors insisted that a 60-pound weight-loss was more than sufficient to portray the emaciated machinist.

(Reuters/Paramount Classics)

christian-bale-in-'the-machinist'

Charlize Theron

The first name that comes to mind when you think of gorgeous stars looking downright ugly for a part is Charlize Theron. She won an Academy Award for doing so in "Monster."

(Reuters/Media 8 Entertainment)

charlize-theron

Jon Heder

When Jon hit the screen as "Napoleon Dynamite" in 2004, audiences didn't really know that the man behind the frizz wasn't so bad.

(Fox Searchlight Pictures/Reuters)

jon-heder

Cameron Diaz

Cameron Diaz

The gorgeous blue-eyed blonde was unrecognizable with dark eyes and red frizzy hair in "Being John Malkovich."

(Reuters/USA Films)

cameron-diaz

Matt Damon

Matt Damon

Audiences are used to seeing one of People's Sexiest Men Alive as an action hero, but as a fat older dude? That was an adjustment when Matt starred in "The Informant!" (2009)

(Reuters/Warner Bros.)

matt-damon

Russell Crowe

Russell went with grey hair and a beer gut to play a CIA officer in "Body of Lies." The fact that he was starring opposite heart-throb Leonardo DiCaprio made him look even worse.

(Warner Bros./Reuters)

russell-crowe

Jessica Alba

The brunette stunner had to go with a "plain Jane" look for "An Invisible Sign" in 2010. Not surprisingly, even simple and understated looks good on her.

(Reuters/IFC Films)

jessica-alba

Johnny Depp

It seems as though Johnny Depp has always played down his looks for his craft. It started back with "Edward Scissorhands" in 1990 and he put on the white makeup again for "Sweeney Todd" in 2007.